AD7715ANZ-3 Analog Devices Inc, AD7715ANZ-3 Datasheet - Page 29

• Manufacturer Part Number: AD7715ANZ-3
• Description: IC ADC 16BIT SIGMA-DELTA 16DIP
• Manufacturer: Analog Devices Inc

Specifications of AD7715ANZ-3

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Bits: 16
• Sampling Rate (per Second): 500
• Number Of Converters: 1
• Power Dissipation (max): 9.5mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Resolution (bits): 16bit
• Input Channel Type: Differential
• Supply Voltage Range - Analogue: 3V To 3.6V
• Supply Voltage Range - Digital: 3V To 5.25V
• Supply Current: 600µA
• No. Of: RoHS Compliant
• Sampling Rate: 19.2kSPS
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7715-3EBZ - BOARD EVALUATION FOR AD7715
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. C
Smart Transmitters
Another area where the low power, single supply, three-wire
interface capabilities is of benefit is in smart transmitters. Here,
the entire smart transmitter must operate from the 4 mA to
20 mA loop. Tolerances in the loop mean that the amount of
current available to power the transmitter is as low as 3.5 mA.
SENSORS
RTD
ohm
mV
TC
DV
DD
AD7715
AV
DGND
DD
ISOLATED GROUND
ISOLATED SUPPLY
AGND
REF IN
MCLK
IN
MCLK
OUT
REFERENCE
VOLTAGE
Figure 15. Smart Transmitter Using the AD7715
ISOLATION
BARRIER
MICROCONTROLLER UNIT
*PID
*RANGE SETTING
*CALIBRATION
*LINEARIZATION
*OUTPUT CONTROL
*SERIAL COMMUNICATION
*HART PROTOCOL
V
COM
–29–
CC
The AD7715 consumes only 450 A, leaving 3 mA available for
the rest of the transmitter. Figure 15 shows a block diagram of a
smart transmitter which includes the AD7715. Not shown in
Figure 15 is the isolated power source required to power the
front end.
MAIN TRANSMITTER ASSEMBLY
COM
3V
CONVERTER
BELL 202
MODEM
HART
REFERENCE
D/A
VOLTAGE
WAVEFORM
3V
CONDITIONER
SHAPER
SIGNAL
REGULATOR
VOLTAGE
INPUT/OUTPUT
STAGE
BANDPASS
FILTER
AD7715
LOOP
RTN
4–20mA